CN114137360B - Power distribution network fault positioning method, device and storage medium - Google Patents
Power distribution network fault positioning method, device and storage medium Download PDFInfo
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- 238000012545 processing Methods 0.000 claims description 13
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- 238000010606 normalization Methods 0.000 claims description 8
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- 230000003287 optical effect Effects 0.000 description 6
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention discloses a power distribution network fault positioning method, a device and a storage medium, wherein the method comprises the following steps: acquiring a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements; calculating a fault matching value of each element, and selecting an element with the smallest fault matching value as a fault element; and carrying out fault ranging on the fault element, and determining the actual position of the fault. By the technical scheme, the fault location of the power distribution network can be rapidly and accurately carried out.
Description
Technical Field
The embodiment of the invention relates to the technical field of power distribution networks, in particular to a power distribution network fault positioning method, a power distribution network fault positioning device and a storage medium.
Background
With the development of intelligent power distribution network technology, the distributed energy sources accessed by the power distribution network are more and more, and the topology of the distributed energy sources is also becoming more and more complex, so that as an important tie for connecting power users and a transmission network, fault positioning of the power distribution network is a current hot problem.
The existing power distribution network fault positioning method adopts a matrix method, performs topology description on a power distribution network by combining the topological structure characteristics of the power distribution network on the basis of graph theory knowledge to obtain a description matrix of the power distribution network, then generates a fault information matrix according to fault information uploaded by a feeder terminal device, and performs fault positioning. However, under the condition that the distributed energy capacity and control have uncertainty, the fault characteristics and the operation characteristics of the power distribution network become atypical, so that a fault indication unit cannot give out a correct fault signal, and thus fault location failure is caused, the most original fault characteristic data is difficult to be adopted by a matrix method by adopting 0-1 variable, and the applicability is low under the condition of new energy access.
Disclosure of Invention
The invention provides a power distribution network fault positioning method, a device and a storage medium, which are used for rapidly and accurately positioning the power distribution network fault.
In a first aspect, an embodiment of the present invention provides a method for locating a fault in a power distribution network, where the method includes:
acquiring a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements;
calculating a fault matching value of each element, and selecting an element with the smallest fault matching value as a fault element;
and carrying out fault ranging on the fault element, and determining the actual position of the fault.
Optionally, after acquiring the power distribution network fault network, the method further includes: carrying out normalization processing on a power distribution network fault network; wherein, the fault current at any element of the power distribution network fault network after normalization processing is as followsRepresenting the component current injected from one direction, < +.>Representing the component current injected from the other direction, +.>Representing the current injected from the element, 0 < alpha < 1.
Optionally, calculating the fault-matching value for each element includes: constructing a state estimation equation according to real-time measurement data of a power distribution network fault network and the wiring topology of the power distribution network; calculating an estimation result of the state characteristic quantity of the system according to the state estimation equation; and calculating the estimation result of the system state characteristic quantity and the fault matching value of the actual system state characteristic.
Alternatively, the state estimation equation is z=h·x+r; wherein z represents current and voltage data measured in real time, and H is the topology of the distribution network wiringThe formed measurement equation information matrix, x represents the state characteristics of the power distribution network, and r represents the error between the measurement equation information matrix and the actual state; estimation result of system state feature quantityWherein R is a variance diagonal matrix of the measurement error; fault matching value j= (z-h.x) T R -1 (z-H·x)。
Optionally, performing fault location on the faulty component, and determining an actual location of the fault includes: the magnitude of the component current injected from both directions, which is measured by the estimation result of the system state feature quantity, determines the actual position of the fault in accordance with (1- α): α.
Optionally, before fault location is performed on the faulty element and the actual location of the fault is determined, the method further includes: and carrying out fault phase selection according to the fault element.
Optionally, performing fault phase selection according to the fault element includes: constructing a three-phase fault network, wherein the three-phase fault network comprises an A-phase fault network, a B-phase fault network and a C-phase fault network; and respectively calculating the sum of component currents injected from two directions of the A phase fault network, the B phase fault network and the C phase fault network, and carrying out fault phase selection according to whether the fault current occurs to the phase.
Optionally, the elements are bus bars and/or segmented lines.
In a second aspect, an embodiment of the present invention further provides a fault location device for a power distribution network, where the device includes:
the information acquisition module is used for acquiring a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements;
the fault element matching module is used for calculating a fault matching value of each element and selecting an element with the minimum fault matching value as a fault element;
the fault location determining module is used for carrying out fault distance measurement on the fault element and determining the actual location of the fault.
In a third aspect, an embodiment of the present invention further provides a fault location device for a power distribution network, including a memory, a processor, and a computer program stored on the memory and capable of running on the processor, where the processor is configured to implement the fault location method for a power distribution network according to any one of the embodiments of the present invention when the computer program is executed.
In a fourth aspect, an embodiment of the present invention further provides a computer readable storage medium, where a computer program is stored, where the program when executed by a processor implements a fault location method for a power distribution network according to any one of the embodiments of the present invention.
According to the invention, the power distribution network fault network is obtained, and the power distribution network fault network comprises a plurality of elements; calculating a fault matching value of each element, and selecting an element with the smallest fault matching value as a fault element; the fault location is carried out on the fault element, the actual position of the fault is determined, the problems that in the prior art, the fault location is invalid due to the uncertainty of the distributed energy capacity and control and the applicability of the fault location of the power distribution network is low when new energy is accessed are solved, and the fault location of the power distribution network can be carried out rapidly and accurately.
Drawings
Fig. 1 is a schematic flow chart of a fault location method for a power distribution network according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of an overall architecture of a fault location method for a power distribution network according to a first embodiment of the present invention;
FIG. 3 is a flow chart of another method for locating faults in a power distribution network according to the first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fault location device for a power distribution network according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fault location device for a power distribution network according to a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a schematic flow chart of a power distribution network fault locating method according to a first embodiment of the present invention, fig. 2 is a schematic overall architecture of a power distribution network fault locating method according to a first embodiment of the present invention, where the first embodiment is applicable to monitoring fault conditions of elements of a power distribution network in real time and locating fault elements, the method may be performed by a power distribution network fault locating device according to the first embodiment of the present invention, and the power distribution network fault locating method according to the first embodiment of the present invention will be further described with reference to fig. 1 and 2, as shown in fig. 1, and specifically includes the following steps:
step 101, acquiring a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements.
The power distribution network is a network which is composed of overhead lines, cables, towers, distribution transformers, isolating switches, reactive compensation capacitors, some auxiliary facilities and the like and can distribute electric energy in the power network, the elements are buses and/or segmented lines, the buses are conductors for collecting, distributing and transmitting electric energy, and the buses comprise hard buses, soft buses, closed buses and the like.
Specifically, when a fault point occurs in the power distribution network, the network topology of the power distribution network changes, so that a power distribution network fault network is formed, the fault positions are different, and the power distribution network fault networks are also different.
Optionally, after the power distribution network fault network is obtained, normalization processing can be performed on the power distribution network fault network; wherein, the fault current at any element of the power distribution network fault network after normalization processing is as followsRepresenting the component current injected from one direction, < +.>Representing the component current injected from the other direction, +.>Representing slaveThe current injected at the element is more than 0 and less than 1.
Specifically, fault current is injected from any fault point on the line, and can be equivalently injected from two ends of the line into fault currents with different component sizes respectively, and based on the principle, the power distribution network fault network is normalized, so that the equivalence of an external fault line is realized.
For example, when a line fails, a (reverse) current injection point is added at the failure point, and according to the triangular change of the circuit star, a group of currents are injected at two sides of the failure line, wherein the sum of the two groups of newly injected currents is equal to the current injected at one point of the failure point, and the ratio of the two groups of newly injected currents is inversely proportional to the impedance value from the failure point to two ends of the line. For example, the fault current at fault point A isThen, it can be considered that the current injected from the failed element isIt can be equivalent to injecting fault currents of different component magnitudes from both ends of the line>And->And the power distribution network fault network can be normalized, and the equivalence of the external fault line is realized.
In particular, the normalized fault network has the same manifestation form for different fault types (fault points, transition resistances) of the same element, and the difference is only the difference of the current distribution magnitudes at two sides. The position of the fault point after normalization can be reflected by the magnitude of the component fault current injected at both ends of the line, so as to determine the fault network, thereby representing the fault condition of different elements.
Step 102, calculating a fault matching value of each element, and selecting an element with the smallest fault matching value as a fault element.
The fault matching value of the element refers to a value used for reflecting the matching degree between the state estimation value of the current element and the state estimation value when the current element breaks down, and the closer the matching value is, the better the matching effect is, and the greater the possibility of the current element breaking down is. Specifically, the position of the fault original can be determined by matching the fault network topology of the power distribution network according to the state estimation result of the minimum fault network.
Alternatively, the method of calculating the fault-matching value for each element may include the following three steps:
step 1, constructing a state estimation equation according to real-time measurement data of a power distribution network fault and the wiring topology of the power distribution network;
step 2, calculating an estimation result of the state characteristic quantity of the system according to a state estimation equation;
wherein, the state estimation equation is z=h·x+r; wherein z represents current and voltage data measured in real time, H is a measurement equation information matrix formed by the wiring topology of the power distribution network, x represents the state characteristics of the power distribution network, and r represents the error between the measurement equation information matrix and the actual state.
And step 3, calculating the estimation result of the system state characteristic quantity and the fault matching value of the actual system state characteristic.
Estimation result of system state feature quantityWherein R is the variance diagonal matrix of the measurement error. Fault matching value j= (z-h.x) T R- 1 (z-H·x)。
Specifically, the state characteristics of the system are reflected by real-time measurement data and the wiring topology of the power distribution network, wherein the wiring topology of the power distribution network comprises actual wiring of the system; the measurement equation information matrix consists of a node (branch) incidence relation matrix and impedance parameters, can change along with the change of a network structure, and different normalized fault networks have different network structures, so that different fault networks have different node incidence relation matrixes and impedance parameters; converting the real-time measured data into sampling values of voltage and current to form a state estimation equation; the estimation result of the system state characteristic quantity can be solved through state estimation, the matching effect of the state estimation result and the actual system state characteristic is represented through a fault matching value, and the fault matching value and the matching effect are in negative correlation, namely, the larger the fault matching value is, the worse the matching effect is, and the more the uniformly processed fault network deviates from the actually generated fault network.
Specifically, the normalized fault network can truly restore the state characteristics of the fault system, and because the fault network has new branches, compared with the measurement equation of the normal network, the state characteristic vector of the fault network and the information matrix of the measurement equation thereof can be changed, for example, the measurement equation of the normal network is shown as the following formula (1), and when the fault network exists, the measurement equation is shown as the following formula (2):
based on the formulas (1) and (2), the state estimation of the fault network can be solved by combining the state estimation equation, the estimation result of the system state characteristic quantity and the fault matching value, so that the fault matching value of the fault network is obtained, and the element corresponding to the fault network with the minimum fault matching value is the fault element.
And 103, performing fault location on the fault element to determine the actual position of the fault.
Wherein, fault location is carried out on the fault element, and the method for determining the actual position of the fault can comprise the following steps: the magnitude of the component current injected from both directions, which is measured by the estimation result of the system state feature quantity, determines the actual position of the fault in accordance with (1- α): α.
Optionally, before fault location is performed on the faulty element and the actual location of the fault is determined, the method further includes: and carrying out fault phase selection according to the fault element.
After determining the fault element, the fault component currents at two ends of the three-phase fault network are summed to judge whether the fault current occurs in the phase or not, so that the phase is determined.
Specifically, performing fault phase selection according to the fault element includes: constructing a three-phase fault network, wherein the three-phase fault network comprises an A-phase fault network, a B-phase fault network and a C-phase fault network; and respectively calculating the sum of component currents injected from two directions of the A phase fault network, the B phase fault network and the C phase fault network, carrying out fault phase selection according to whether the phase has fault current, and if one phase has fault current, obtaining a fault option result as the phase.
Alternatively, as shown in fig. 2, the fault location method for the power distribution network integrally includes three parts: (1) distribution substation layer: the method comprises the following steps of troubleshooting original fault, selecting phase fault, measuring distance fault and other algorithm models; (2) a communication layer: a communication network composed of 100/1000Mbps Ethernet; (3) a measuring device: and at the power distribution network data acquisition terminal, the terminal equipment is responsible for acquiring the voltage and current quantity of the primary equipment in real time, storing and processing the voltage and current quantity into a fusion sampling value, and finally transmitting the fusion sampling value to the distribution electronic station layer through the communication layer by the communication module. The fault location of the power distribution network can be completed through the cooperative work of the electronic station distribution layer, the communication layer and the measuring device.
Fig. 3 is a flow chart of another fault location method for a power distribution network according to the first embodiment of the present invention, and as can be seen from fig. 3, the method specifically includes the following steps:
s301, normalizing the power distribution network fault network.
Specifically, fault currents of different components are respectively injected into two ends of a fault line to equivalent the fault current of any fault point on the line, the fault line is externally equivalent, and the uniqueness of the fault network is reflected through the unbalance of the magnitudes of the injected current components at the two ends.
S302, converting the real-time measured data into voltage and current sampling values, and establishing a fault network state estimation equation of the element by combining the distribution network wiring topology.
S303, estimating and solving the system state.
Specifically, an estimation result of the system state feature quantity is obtained, the matching degree between the state estimation result and the system state feature is calculated, whether the matching degree is smaller than the current minimum value is judged, and the fault element corresponding to the minimum fault network is confirmed.
S304, fault phase selection and fault distance measurement are carried out.
Specifically, after determining the fault original, constructing fault networks for A, B, C three phases respectively, calculating the fault component currents at two ends of the A, B, C three-phase fault network, solving the sum of the fault component currents at two ends of the three-phase fault network, judging whether the fault current occurs in the phase, and performing fault phase selection according to the criterion. And secondly, calculating and carrying out fault distance measurement by using the magnitude of the fault component current at two ends, which is measured by using the state estimation result, in a mode of (1-alpha): alpha.
According to the technical scheme, a power distribution network fault network is obtained, and the power distribution network fault network comprises a plurality of elements; calculating a fault matching value of each element, and selecting an element with the smallest fault matching value as a fault element; the fault location is carried out on the fault element, the actual position of the fault is determined, the problems that in the prior art, the fault location is invalid due to the uncertainty of distributed energy capacity and control and the applicability of the fault location of the power distribution network is low when new energy is accessed are solved, the current and voltage values of the power distribution network measured in real time are used as data supports, different expression forms of the fault network are considered, the fault network is judged through a state estimation system state characteristic calculation mode, the fault element is checked, the fault distance determination of fault phase judgment is carried out, and the fault location of the power distribution network can be carried out rapidly and accurately.
Example two
The power distribution network fault positioning device provided by the second embodiment of the invention can execute the power distribution network fault positioning method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Fig. 4 is a schematic structural diagram of a fault location device for a power distribution network according to a second embodiment, as shown in fig. 4, including: an information acquisition module 401, a fault element matching module 402, and a fault location determination module 403.
The information obtaining module 401 is configured to obtain a power distribution network fault network, where the power distribution network fault network includes a plurality of elements.
The failure component matching module 402 is configured to calculate a failure matching value of each component, and select a component with a minimum failure matching value as a failure component.
The fault location determining module 403 is configured to perform fault location on the faulty component, and determine an actual location of the fault.
In order to implement the power distribution network fault positioning method in the foregoing embodiment, the power distribution network fault positioning device provided in this embodiment has similar implementation principles and technical effects to those of the foregoing embodiment, and will not be described herein again.
Optionally, the device further comprises an information processing module, which is used for carrying out normalization processing on the power distribution network fault network after the power distribution network fault network is acquired; wherein, the fault current at any element of the power distribution network fault network after normalization processing is as followsRepresenting the component current injected from one direction, < +.>Representing the component current injected from the other direction, +.>Representing the current injected from the element, 0 < alpha < 1.
Optionally, the fault element matching module 402 is specifically configured to construct a state estimation equation according to real-time measurement data of a fault network of the power distribution network and a wiring topology of the power distribution network; calculating an estimation result of the state characteristic quantity of the system according to the state estimation equation; and calculating the estimation result of the system state characteristic quantity and the fault matching value of the actual system state characteristic.
Alternatively, the state estimation equation is z=h·x+r; wherein z represents current and voltage data measured in real time, H is a measurement equation information matrix formed by the wiring topology of the power distribution network, x represents the state characteristics of the power distribution network, and r represents the error between the measurement equation information matrix and the actual state; estimation result of system state feature quantityWherein R is a variance diagonal matrix of the measurement error; fault matching value j= (z-h.x) T R -1 (z-H·x)。
Optionally, the fault location determining module 403 is specifically configured to determine the actual location of the fault according to (1- α): α by measuring the magnitudes of the component currents injected from two directions according to the estimation result of the system state feature quantity.
Optionally, the apparatus further comprises: the fault phase selection module is used for carrying out fault phase selection according to the fault element before carrying out fault location on the fault element and determining the actual position of the fault.
Optionally, the fault phase selection module is specifically configured to construct a three-phase fault network, where the three-phase fault network includes an a-phase fault network, a B-phase fault network, and a C-phase fault network; and respectively calculating the sum of component currents injected from two directions of the A phase fault network, the B phase fault network and the C phase fault network, and carrying out fault phase selection according to whether the fault current occurs to the phase.
Optionally, the elements are bus bars and/or segmented lines.
Example III
Fig. 5 is a schematic structural diagram of a fault location device for a power distribution network according to a third embodiment of the present invention. Fig. 5 illustrates a block diagram of an exemplary power distribution network fault locating device 12 suitable for use in implementing embodiments of the present invention. The power distribution network fault location device 12 shown in fig. 5 is only an example and should not be construed as limiting the functionality and scope of use of embodiments of the present invention.
As shown in fig. 5, the distribution network fault location apparatus 12 is embodied in the form of a general purpose computing device. The components of the power distribution network fault locating device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, a bus 18 that connects the various system components, including the system memory 28 and the processing units 16.
Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, and a local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include Industry Standard Architecture (ISA) bus, micro channel architecture (MAC) bus, enhanced ISA bus, video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
The power distribution network fault location device 12 typically includes a variety of computer system readable media. Such media can be any available media that can be accessed by the distribution network fault location device 12, including both volatile and nonvolatile media, removable and non-removable media.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 30 and/or cache memory 32. The power distribution network fault location device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from or write to non-removable, nonvolatile magnetic media (not shown in FIG. 5, commonly referred to as a "hard disk drive"). Although not shown in fig. 5, a magnetic disk drive for reading from and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading from or writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In such cases, each drive may be coupled to bus 18 through one or more data medium interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored in, for example, memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules 42 generally perform the functions and/or methods of the embodiments described herein.
The power distribution network fault location apparatus 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), with one or more devices that enable a user to interact with the power distribution network fault location apparatus 12, and/or with any device (e.g., network card, modem, etc.) that enables the power distribution network fault location apparatus 12 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 22. In addition, in the power distribution network fault location device 12 of the present embodiment, the display 24 is not present as a separate body, but is embedded in the mirror surface, and when the display surface of the display 24 is not displayed, the display surface of the display 24 and the mirror surface are visually integrated. Also, the distribution network fault location device 12 may also communicate with one or more networks, such as a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet, through the network adapter 20. As shown in fig. 5, the network adapter 20 communicates with other modules of the power distribution network fault location device 12 via the bus 18. It should be appreciated that although not shown in fig. 5, other hardware and/or software modules may be used in connection with the power distribution network fault location device 12, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, for example, to implement a power distribution network fault location method provided by an embodiment of the present invention, where the method includes:
acquiring a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements;
calculating a fault matching value of each element, and selecting an element with the smallest fault matching value as a fault element;
and carrying out fault ranging on the fault element, and determining the actual position of the fault.
Example IV
A fourth embodiment of the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method for locating faults in a power distribution network according to all embodiments of the present invention, where the method includes:
acquiring a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements;
calculating a fault matching value of each element, and selecting an element with the smallest fault matching value as a fault element;
and carrying out fault ranging on the fault element, and determining the actual position of the fault.
Any combination of one or more computer readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. The utility model provides a distribution network fault location method which is characterized in that the method comprises the following steps:
acquiring a power distribution network fault network, wherein the power distribution network fault network comprises a plurality of elements;
calculating a fault matching value of each element, and selecting an element with the smallest fault matching value as a fault element;
performing fault ranging on the fault element to determine the actual position of the fault;
after acquiring the power distribution network fault network, the method further comprises the following steps:
normalizing the power distribution network fault network;
wherein the fault current at any element of the power distribution network after normalization processing is Representing the component current injected from one direction, < +.>Representing the component current injected from the other direction, +.>Representing the current injected from the element, 0 < alpha < 1;
said calculating a fault-matching value for each of said elements comprising:
constructing a state estimation equation according to the real-time measurement data of the power distribution network fault network and the power distribution network wiring topology;
calculating an estimation result of the state characteristic quantity of the system according to the state estimation equation;
calculating the estimation result of the system state characteristic quantity and the fault matching value of the actual system state characteristic;
the state estimation equation is z=h·x+r; wherein z represents current and voltage data measured in real time, H is a measurement equation information matrix formed by the wiring topology of the power distribution network, x represents the state characteristics of the power distribution network, and r represents the error between the measurement equation information matrix and the actual state;
the distribution network wiring topology comprises actual wiring of a system, and the measurement equation information matrix comprises a node association relation matrix and impedance parameters;
estimation results of the system state feature quantityWherein R is a variance diagonal matrix of the measurement error;
the fault matching value J= (z-H. X) T R -1 (z-H·x)。
2. The method for locating a fault in a power distribution network according to claim 1, wherein said performing fault location on the faulty component to determine an actual location of the fault includes:
the magnitude of the component current injected from both directions, which is measured by the estimation result of the system state feature quantity, determines the actual position of the fault in accordance with (1- α): α.
3. The power distribution network fault location method as claimed in claim 1, further comprising, before performing fault location on the fault element to determine an actual location of the fault:
and carrying out fault phase selection according to the fault element.
4. A power distribution network fault location method according to claim 3, wherein said performing fault phase selection according to said fault element comprises:
constructing a three-phase fault network, wherein the three-phase fault network comprises an A-phase fault network, a B-phase fault network and a C-phase fault network;
and respectively calculating the sum of component currents injected from two directions of the A phase fault network, the B phase fault network and the C phase fault network, and carrying out fault phase selection according to whether the fault current occurs to the phase.
5. The power distribution network fault location method of claim 1, wherein the elements are bus bars and/or segmented lines.
6. A power distribution network fault locating device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor for implementing the power distribution network fault location method according to any of claims 1-5 when the computer program is executed.
7. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the power distribution network fault location method according to any one of claims 1-5.
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